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Topic summary

Styrene

Styrene
Names Preferred IUPAC name
Ethenylbenzene
Other names
Styrene
Vinylbenzene
Phenylethene
Phenylethylene
Cinnamene
Styrol
Diarex HF 77
Styrolene
Styropol
Identifiers
3D model (JSmol)
1071236 ChEBI
ChEMBL
ChemSpider
ECHA InfoCard100.002.592EC Number
  • 202-851-5
2991 KEGG
RTECS number
  • WL3675000
UNII
UN number2055
  • InChI=1S/C8H8/c1-2-8-6-4-3-5-7-8/h2-7H,1H2
    Key: PPBRXRYQALVLMV-UHFFFAOYSA-N
  • c1ccccc1C=C
Properties C8H8Molar mass104.15 g/mol Appearance colorless oily liquid Odorsweet and floral Density0.909 g/cm Melting point−30 °C (−22 °F; 243 K) Boiling point145 °C (293 °F; 418 K) 0.03% (20 °C) log P2.70 Vapor pressure5 mmHg (20 °C) −6.82×10 cm/mol1.5469 Viscosity0.762 cP at 20 °C Structure 0.13 DHazards Occupational safety and health (OHS/OSH):
Main hazards
flammable, toxic, probably carcinogenicGHS labelling: DangerH226, H315, H319, H332, H361, H372P201, P202, P210, P233, P240, P241, P242, P243, P260, P264, P270, P271, P280, P281, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P308+P313, P312, P314, P321, P332+P313, P337+P313, P362, P370+P378, P403+P235, P405, P501NFPA 704 (fire diamond)
2
3
2
Flash point31 °C (88 °F; 304 K) Explosive limits0.9–6.8% Lethal dose or concentration (LD, LC): 2194 ppm (mouse, 4 h)
5543 ppm (rat, 4 h) 10,000 ppm (human, 30 min)
2771 ppm (rat, 4 h) NIOSH (US health exposure limits):
PEL (Permissible)
TWA 100 ppm C 200 ppm 600 ppm (5-minute maximum peak in any 3 hours)
REL (Recommended)
TWA 50 ppm (215 mg/m)
ST 100 ppm (425 mg/m)
IDLH (Immediate danger)
700 ppm Safety data sheet (SDS) SDSRelated compounds
Related styrenes;
related aromatic compounds
polystyrene, stilbene;
ethylbenzene
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Styrene is an organic compound with the chemical formula C6H5CH=CH2. Its structure consists of a vinyl group as substituent on benzene. Styrene is a colorless, oily liquid, although aged samples can appear yellowish. The compound evaporates easily and has a sweet smell, although high concentrations have a less pleasant odor. Styrene is the precursor to polystyrene and several copolymers, and is typically made from benzene for this purpose. Approximately 25 million tonnes of styrene were produced in 2010, increasing to around 35 million tonnes by 2018.

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